package com.ljl.forum_1.interceptor;

import com.ljl.forum_1.config.AppConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Keafmd
 *
 * @ClassName: LoginInterceptor
 * @Description: 登录拦截器
 * @author: lijl
 * @date: 2025/2/8 11:45
 * @Blog: https://keafmd.blog.csdn.net/
 */
@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Value("${forum.login.url}")
    private String defaultURL;
    // 前置处理，预处理
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取session对象
        HttpSession session = request.getSession(false);
        // 判断session对象是否有效
        if (session != null && session.getAttribute(AppConfig.USER_SESSION) != null) {
            // 表示用户在登录状态，校验通过
            return true;
        }
        // 校验url是否正确
        if (!defaultURL.startsWith("/")) {
            defaultURL = "/" + defaultURL;
        }
        // 校验不通过，跳转到登录页面
        response.sendRedirect(defaultURL);
        // 终端流程
        return false;
    }
}
